#!/bin/bash
# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Fail on any error
set -e

# Display commands being run
set -x

# Only run the linter on go1.15, because:
# - It only has to run once per CI (so we just have to pick 1 version).
if [[ $(go version) != *"go1.15"* ]]; then
  exit 0
fi

go install \
  github.com/golang/protobuf/protoc-gen-go \
  golang.org/x/lint/golint \
  golang.org/x/tools/cmd/goimports

# Fail if a dependency was added without the necessary go.mod/go.sum change
# being part of the commit.
go mod tidy
for i in $(find . -name go.mod); do
  pushd $(dirname $i)
  go mod tidy
  popd
done
git diff go.mod | tee /dev/stderr | (! read)
git diff go.sum | tee /dev/stderr | (! read)

gofmt -s -d -l . 2>&1 | tee /dev/stderr | (! read)
goimports -l . 2>&1 | tee /dev/stderr | (! read)

# Runs the linter. Regrettably the linter is very simple and does not provide the ability to exclude rules or files,
# so we rely on inverse grepping to do this for us.
#
# Piping a bunch of greps may be slower than `grep -vE (thing|otherthing|anotherthing|etc)`, but since we have a good
# amount of things we're excluding, it seems better to optimize for readability.
#
# Note: since we added the linter after-the-fact, some of the ignored errors here are because we can't change an
# existing interface. (as opposed to us not caring about the error)
golint ./... 2>&1 | (
  grep -vE "gen\.go" |
    grep -vE "receiver name [a-zA-Z]+[0-9]* should be consistent with previous receiver name" |
    grep -vE "exported const AllUsers|AllAuthenticatedUsers|RoleOwner|SSD|HDD|PRODUCTION|DEVELOPMENT should have comment" |
    grep -v "exported func Value returns unexported type pretty.val, which can be annoying to use" |
    grep -vE "exported func (Increment|FieldTransformIncrement|FieldTransformMinimum|FieldTransformMaximum) returns unexported type firestore.transform, which can be annoying to use" |
    grep -v "ExecuteStreamingSql" |
    grep -v "MethodExecuteSql should be MethodExecuteSQL" |
    grep -vE " executeStreamingSql(Min|Rnd)Time" |
    grep -vE " executeSql(Min|Rnd)Time" |
    grep -vE "pubsub\/pstest\/fake\.go.+should have comment or be unexported" |
    grep -v "ClusterId" |
    grep -v "InstanceId" |
    grep -v "firestore.arrayUnion" |
    grep -v "firestore.arrayRemove" |
    grep -v "maxAttempts" |
    grep -v "UptimeCheckIpIterator" |
    grep -vE "apiv[0-9]+" |
    grep -v "ALL_CAPS" |
    grep -v "go-cloud-debug-agent" |
    grep -v "mock_test" |
    grep -v "internal/testutil/funcmock.go" |
    grep -v "internal/backoff" |
    grep -v "internal/trace" |
    grep -v "internal/gapicgen/generator" |
    grep -v "a blank import should be only in a main or test package" |
    grep -v "method ExecuteSql should be ExecuteSQL" |
    grep -vE "spanner/spansql/(sql|types).go:.*should have comment" |
    grep -vE "\.pb\.go:"
) |
  tee /dev/stderr | (! read)

staticcheck -go 1.11 ./... 2>&1 | (
  grep -v S1007 |
    grep -v SA1019 |
    grep -v firestore/internal/doc-snippets.go |
    grep -v functions/metadata/metadata_test.go |
    grep -v spanner/value.go |
    grep -v go-cloud-debug-agent |
    grep -v pubsub/integration_test.go |
    grep -v internal/fields/fold.go |
    grep -v httpreplay/internal/proxy/debug.go |
    grep -v bigtable/internal/cbtconfig/cbtconfig.go |
    grep -v bigtable/cmd/cbt/cbt.go |
    grep -v asset/v1beta1/doc.go |
    grep -v asset/v1beta1/mock_test.go |
    grep -v spanner/value_test.go |
    grep -v bigtable/reader.go |
    grep -v internal/btree/btree.go |
    grep -v container/apiv1/mock_test.go |
    grep -v third_party/pkgsite/synopsis.go
) |
  tee /dev/stderr | (! read)

echo "Done vetting!"
